Run the math on site
Open a calculator, enter the run or load, and get the answer with the governing limit and full breakdown.
BaseMapped product
Coming soon · local-first release prep
BaseCalc HVAC
Run the math. Save the worksheet.
HVAC field calculators and local job worksheets for technicians. Run BTU, CFM, duct, refrigerant, and hydronics math on site, capture scope and quantities, then hand final billing to SpeakSheet.
Coming to App Store & Google Play
See launch statusThe app is not publicly downloadable yet. The local-first release and store records are being prepared for review.
18
HVAC field calculators
JOB
worksheets without billing clutter
Local
first, no account required
Why it works
The calculator and the field worksheet in one tool.
Most apps do either load math or job notes. BaseCalc HVAC keeps BTU, CFM, duct sizing, refrigerant, hydronics, materials, and worksheet capture in the same field workflow.
Capture the worksheet
Keep scope, quantities, site notes, and calculation context in one local job record.
Hand billing to SpeakSheet
BaseCalc HVAC stays focused on field math and job worksheets. SpeakSheet stays the final invoice app.
Calculators
18 HVAC field calculators, every answer explained.
Tons
BTU ↔ Tons
Convert between BTU/hr and refrigeration tons.
CFM
CFM from BTU
Airflow from load and temperature rise/drop.
BTU
BTU from CFM
Load from airflow and temperature difference.
Duct
Duct Sizing
Round and rectangular duct from CFM and velocity.
Velocity
Air Velocity
Velocity from CFM and cross-sectional area.
Psych
Psychrometrics
Total, sensible, and latent BTU/hr estimates.
Lines
Refrigerant Lines
Suction and liquid line size recommendations.
SH/SC
Superheat / Subcooling
Target superheat and subcooling guides.
Load
Room Load
Quick cooling/heating load estimate.
Balance
Heat Pump Balance
Balance point between capacity and heat loss.
GPM
Hydronics
BTU, GPM, and ΔT relationships.
Mix
Mixed Air
Mixed-air temperature from outdoor and return air.
ACH
Air Changes
ACH from CFM and room volume.
Evap
Evaporative Cooling
Supply temperature and tonnage estimate.
Filter
Filter Velocity
Face velocity and pressure drop estimate.
O2/CO2
Combustion Analysis
Excess air from O2 or CO2 readings.
Charge
Refrigerant Weight
Line-set charge estimate in ounces and pounds.
OA CFM
Economizer
Minimum outdoor air CFM per ASHRAE 62.1 concepts.
Real app screens
The field instrument interface.
These are screenshots from the BaseCalc HVAC field workflow.
What's inside
Code-aware math plus field records.
Answers you can defend
Each result shows clear PASS / FAIL messaging, the limit that governs it, the final answer, and the full breakdown.
- Industry-standard references
- Governing limit shown
- Saved job-site history
Job worksheets, not invoices
Create clean field worksheets with scope, quantities, site notes, status, and PDF export without pricing fields.
- Job contacts with site notes
- Scope and quantity capture
- Worksheet PDF export
Built for the field
A high-contrast "field instrument" interface in dark or light, designed to be read on a job site, not a desk.
- Works offline by default
- Light & dark themes
- No account required for v1
Development status
Built and tested. Not in the stores yet.
We keep this honest: BaseCalc HVAC is a finished, tested build, but it is not publicly downloadable today. The remaining work is final store setup, submission, and the launch decision.
Done
Core app tested
All 18 calculators, history, job contacts, worksheets, materials, and PDF export are implemented. The calculator engine test suite covers the field tools.
Done
Local-first privacy model
The v1 launch workflow stores job contacts, worksheets, settings, and calculations on device. No BaseCalc HVAC account or cloud sync is required.
In progress
Store submission next
BaseCalc HVAC is not publicly available yet. The App Store and Google Play records still need final review setup and submission.
In progress
SpeakSheet boundary is intentional
BaseCalc HVAC captures the field worksheet. SpeakSheet remains the customer-facing invoice and billing product.
FAQ
Before you wait for launch.
BaseCalc HVAC is a professional reference tool. Always verify against current industry standards and your local amendments.
Is BaseCalc HVAC available to download?
Not yet. The iOS and Android builds are complete and tested, but the App Store and Google Play listings still need their first manual setup before the app goes into review. It is not publicly downloadable today.
Which calculations does it cover?
18 HVAC field calculators: BTU ↔ Tons, CFM from BTU, BTU from CFM, Duct Sizing, Air Velocity, Psychrometrics, Refrigerant Lines, Superheat / Subcooling, Room Load, Heat Pump Balance, Hydronics, Mixed Air, Air Changes, Evaporative Cooling, Filter Velocity, Combustion Analysis, Refrigerant Weight, and Economizer.
Does it do invoicing too?
No. BaseCalc HVAC intentionally stops at job worksheets: scope, quantities, site notes, calculation history, and worksheet PDFs. Final customer invoices belong in SpeakSheet.
Does it work offline?
Yes. Calculations, history, job contacts, worksheets, settings, and PDF export are designed to work offline in the v1 launch build. No BaseCalc HVAC account is required.
How much will it cost?
The initial launch path can stay free and local-first. Subscriptions or ads should only be disclosed if they are intentionally enabled in the submitted build.
Can I rely on it for code compliance?
BaseCalc HVAC is a professional reference tool. Always verify results against current industry standards, IMC and ASHRAE concepts, and your local amendments. The authority having jurisdiction has the final say.
BaseCalc HVAC by BaseMappedLaunching to the App Store & Google Play soon.
The build is finished and tested. When the store listings go live, BaseCalc HVAC will be the app technicians use to run airflow, load, refrigerant, and hydronics math, save local worksheets, and hand billing to SpeakSheet.